Cats hack up plenty of things on their own, and cat owners sure don't need an increase in volume because of something simple like an avocado. Guacamole and several other human foods can make cats sick.
There's a growing movement to ban the practice of declawing cats, and I'm curious what you think. Oh, and wait until you see what has happened to my fancy leather recliner because I own cats with claws. It's not pretty!